That's a nice shot of the desert, if a little over-exposed, but its not a good test of your developer methods. The books advise using a smooth, out of focus, solid toned area to see if the development is really smooth, but you can often tell from blank sky areas if your methods are producing even toned results. In Cody's shot of the girl, it looks to me like the lighter areas around the edge of the negative are from uneven development, where the developer is moving more vigorously around the edges of the negatives during agitation. This is the shortcoming of both the Yankee and the HP Combi, and tanks in general; the possibility of increased edge development. The movement of developer over a negative must be the same over the entire surface or you will get slight localized increases in development. That produces the light toned vignetting you see on a lot of work.
Thanks for the compliments. I wish I had a my 90mm lens instead of the 210mm I had at the time because of the curved bark. I also think if I had a 29 filter I may have been able to darken the sky. Since I was my first development I just kind of experimented. I also have a Jobo processor that I haven't used yet. I'll test and see if there's a difference between the two processes.